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    <title>Document</title>
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<script>
    // let x = 10;
    // let d = 1.2;
    // //判断数据类型
    // alert(typeof x);

    // let x = "hahaha";
    // let y = '李四';
    // alert(typeof y);

    //获取系统时间
    let time = new Date();
    console.log(time);
</script>
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